Permeability considerations of the minor aquifers associated with the London Clay Formation (Palaeogene) of south Hampshire

The occurrence and distribution of the prominent silty sand/sandstone units (minor aquifers) associated with the London Clay Formation in south Hampshire is reviewed. In situ methods of estimating their permeability are assessed and a constant head test method with an extended filter section is proposed. Permeability data for the minor aquifers is reported, indicating that k values may range from 10⁻⁸ m/s to 10−⁴ m/s with one of the minor aquifers (Whitecliff Member) having a permeability, typically, of 10⁻⁵ m/s.